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Há 23 horas · Other chordates do not show any trends towards cephalization. [14] The rostral end of the neural tube is expanded by a thickening of the walls and expansion of the central canal of spinal cord into three primary brain vesicles: the prosencephalon ( forebrain ), mesencephalon ( midbrain ) and rhombencephalon ( hindbrain ), which are further differentiated in the various vertebrate groups. [24]
- Animalia
- Vertebrata, J-B. Lamarck, 1801
Há 23 horas · An adult narwhal is typically 3.0 to 5.5 m (9.8 to 18.0 ft) in length and 800 to 1,600 kg (1,800 to 3,500 lb) in weight. Carl Linnaeus scientifically described the species in his 1758 work Systema Naturae . The narwhal inhabits Arctic waters, and is vulnerable to predatory attacks from polar bears, orcas and humans.
Há 23 horas · Crocodilia (or Crocodylia, both / krɒkəˈdɪliə /) is an order of mostly large, predatory, semiaquatic reptiles known as crocodilians. They first appeared 94 million years ago in the Late Cretaceous period ( Cenomanian stage) and are the closest living relatives of birds, as the two groups are the only known survivors of the Archosauria.
Há 23 horas · Tigris regalis Gray, 1867. The tiger ( Panthera tigris) is the largest living cat species and a member of the genus Panthera native to Asia. It has a powerful, muscular body with a large head and paws, a long tail, and orange fur with black, mostly vertical stripes.
Há 23 horas · American alligator. The American alligator ( Alligator mississippiensis ), sometimes referred to colloquially as a gator or common alligator, is a large crocodilian reptile native to the Southeastern United States and a small section of northeastern Mexico. It is one of the two extant species in the genus Alligator, and is larger than the only ...
Há 23 horas · Four is the smallest composite number, its proper divisors being 1 and 2. [4] Four is the sum and product of two with itself: , the only non-zero number such that , which also makes four the smallest and only even squared prime number and hence the first squared prime of the form , where is a prime.
Há 23 horas · Протоавіс. «Protoavis». пізній тріас 210М. Техас, США. nomen dubium — можливо це лише химера (суміш залишків різних видів). Вважався близьким до предків птахів у деяких нетероподових теоріях походження ...
